US PATENT SUBCLASS 137 / 247.17
.~.~.~.~ Plural valves or valve seats

Current as of: June, 1999
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137 /   HD   FLUID HANDLING

247  DF  WITH LIQUID VALVES OR LIQUID TRAP SEALS {3}
247.11  DF  .~ Liquid seal in liquid flow line; flow liquid forms seal {8}
247.13  DF  .~.~ Valves {1}
247.15  DF  .~.~.~ Line condition change responsive {3}
247.17.~.~.~.~ Plural valves or valve seats

DEFINITION

Classification: 137/247.17

(under subclass 247.15) Apparatus having a plurality of line condition responsive valves or having such a valve which seats alternatively on one of a plurality of seats.

SEE OR SEARCH THIS CLASS, SUBCLASS:

512+, for plural direct response valves.

516.25, for check valves having serially arranged plural seats.

613+, for systems with plural serial valves in a single flow path.

SEE OR SEARCH CLASS 251, Valves and Valve Actuation,

211, for a valve, per se, having serial alternately closed ports.